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Sorry it took so long to get back to you. I don't know this level of
detail concerting RPG so I asked around trying to find out if character
parameters in RPG are passed on the stack or if a pointer is passed. No
one answered my question but I would think they would be passed by
reference. I would think it would work better if it was pass by reference.
Anyone else on the forum know how character parameters are passed in RPG?
David Wall
AS/400 Toolbox for Java
"Price, Chris"
<chris_price@nsb.c To: "'JAVA400-L@midrange.com'"
<JAVA400-L@midrange.com>
o.uk> cc:
Sent by: Subject: RE: AS400 Toolbox
problems - ServiceProgramCall
owner-java400-l@mi
drange.com
08/14/2001 10:18
AM
Please respond to
JAVA400-L
Thanks for your example.
Unfortunately it didn't work on my system as we don't seem to have a
QTOCNETSTS service program.
I'm trying to call my own service program, written in RPG IV.
The Java class sets the String input parameter to a test value, and calls
the procedure. The procedure compares the passed in string to a value, and
if the same returns 99, otherwise returns -1. If written as a service
program, the return value is always -1. Yet if I convert the service
program
into a program, making the nessesscary changes to the class, the return
value is 99.
Here's a sample of my Java & RPG code:
public class Temp
{
public static void main(String[] parameters) {
AS400 as400 = new AS400();
QSYSObjectPathName sprogramName =
new QSYSObjectPathName("R1005DVOBJ", "CJPTEST", "SRVPGM");
ServiceProgramCall spgm = new ServiceProgramCall(as400);
//Service Program Call
try {
// One Parameter - String in. Returns short
ProgramParameter[] parmlist = new ProgramParameter[1];
AS400Text text1 = new AS400Text(10, as400);
byte[] text = text1.toBytes("CHRISPRICE");
// parmlist[0] = new ProgramParameter(text);
parmlist[0] = new ProgramParameter();
parmlist[0].setInputData(text);
parmlist[0].setParameterType(ProgramParameter.PASS_BY_VALUE);
//run the serivce program
spgm.setProgram(sprogramName.getPath(), parmlist);
spgm.setProcedureName("CJPTEST_PROC");
if (spgm.run() != true) {
AS400Message[] msgList = spgm.getMessageList();
System.out.println("The program did not run. AS/400
messages:");
for (int i = 0; i < msgList.length; i++) {
System.out.println(msgList[i].getText());
}
} else {
AS400Bin2 as400Int = new AS400Bin2();
byte[] as400Data = spgm.getReturnValue();
short result = as400Int.toShort(as400Data, 0);
System.out.println("Service Program Call Result is : " +
result);
}
} catch (Exception e) {
System.out.println("Service Program call failed");
System.out.println(e);
}
System.exit(0);
}
}
The very simple RPG module:
D CJPTEST_PROC PR 5I 0
D String 10 Value
P CJPTEST_PROC B Export
D PI 5I 0
D String 10 Value
C If String = 'CHRISPRICE'
C Return 99
C Else
C Return -1
C Endif
-----Original Message-----
From: Dave Wall [mailto:dawall@us.ibm.com]
Sent: 14 August 2001 15:45
To: JAVA400-L@midrange.com
Subject: Re: AS400 Toolbox problems - ServiceProgramCall
Here is code to call entry point QtocLstNetIfc in service program
QTOCNETSTS. The entry point takes three parameters -- two strings (passed
by reference) and the error code. The strings are converted from Unicode
to EBCDIC before being sent to the server. When calling programs or
service programs, pay particular attention to lengths. The Toolbox client
passes data to the program call server who dumps the data in one big
buffer. It then passes pointers to that buffer or pulls data out of the
buffer when calling the service program. If a length is off the wrong data
will be passed, but since all data comes out of one big buffer you may not
get a addressing errors (trying to get to memory you don't own). You will
just get bad data.
Are you trying to call an OS/400 service program or one of your own? Some
Toolbox objects are implemented by calling OS/400 service programs via
ServiceProgramCall so I know it can work.
AS400 system = new AS400();
// The first parm is 20 characters, 10 chars of user space followed
by 10 chars of library.
// Create a converter for 20 chars.
AS400Text char20 = new AS400Text(20, system);
// The second parm is the format name (8 chars). Create a
converter.
AS400Text char8 = new AS400Text(8, system);
// Create program parameters
ProgramParameter[] parms = new ProgramParameter[3];
// First parm is qualified user space CHAR(20)
// CHAR(0-9) is the user space name
// CHAR(10-19) is the library name
String qSpace = "DAW DAW ";
// First parm is the library qualified UserSpace
parms[0] = new ProgramParameter(char20.toBytes(qSpace));
parms[0].setParameterType(ProgramParameter.PASS_BY_REFERENCE);
// Second parm is the format
parms[1] = new ProgramParameter(char8.toBytes("NIFC0100"));
parms[1].setParameterType(ProgramParameter.PASS_BY_REFERENCE);
// Last parm is the error code. We pass an array of 0x00s so
messages are returned.
byte[] bytes = new byte[32];
parms[2] = new ProgramParameter(bytes, 32);
parms[2].setParameterType(ProgramParameter.PASS_BY_REFERENCE);
ServiceProgramCall sPGMCall = null;
System.out.println("About to create the program");
sPGMCall = new ServiceProgramCall(system,
"/QSYS.LIB/QTOCNETSTS.SRVPGM",
"QtocLstNetIfc",
ServiceProgramCall.NO_RETURN_VALUE,
parms);
System.out.println(sPGMCall.run());
AS400Message[] ml = sPGMCall.getMessageList();
for (int i=0; i<ml.length; i++)
System.out.println(ml[i].getID() + ": " + ml[i].getText());
David Wall
553-5329
AS/400 Toolbox for Java
"Price, Chris"
<chris_price@nsb.c To:
"'java400-l@midrange.com'" <java400-l@midrange.com>
o.uk> cc:
Sent by: Subject: AS400 Toolbox
problems - ServiceProgramCall
owner-java400-l@mi
drange.com
08/14/2001 05:31
AM
Please respond to
JAVA400-L
Has anyone successfully managed to call a procedure in a service program,
using the ServiceProgramCall class?
I'm having major problems getting this to work:
Passing by reference doesn't work at all - get null pointer errors in the
procedure.
Passing by value works for integers, but Strings get garbled. I thought
this
might be a CCSID problem, but the same code works fine for a ProgramCall.
Does anyone have any working examples using this class, there aren't any
that I can find in the toolbox documentation.
Confused,
Chris.
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